[R] Iterations

[Jeff Newmiller]

rkevinburton at charter.net wrote:
> I have a command that reads in some data:
> 
> x <- read.csv("Sales2007.dat", header=TRUE)
> 
> Then I try to organize the data:
> 
> sc <- split(x, list(x$Category, x$SubCategory), drop=TRUE)
> 
> Then I want to iterate through the data. I was able to get the following to run on the R console:
> 
> for(i in 1:length(sc))
> {
>     sum(sc[[i]]$Quantity)
> }
> 
> But notiing is primted on the console. I find that:
> 
> for(i in 1:100)
> {
>     i
> }
> 
> Also does't output anything? I am probably making a wrong assumption here. Why desn't the loop seem to output anyything?
> 
> Thank you.

Entering an expression interactively behaves differently than entering
one in the context of another statement or function.

See the FAQ:

http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html#Why-is-the-output-not-printed-when-I-source_0028_0029-a-file_003f

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